Clamping device for sewing-machine attachments



(No Model.)

R. S. BARNUM.

GLAMPING DEVICE FOR SEWING MACHINE ATTAGHMENT3. No. 267,992. PatentedNov. 28, 1882.

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UNITED STATES PATENT ()FFICE.

RUSSEL S. BARNUM, OF CHICAGO, ILLINOIS.

CLAMP ING DEVICE FOR SEWING-MACHINE ATTACHMENTS.

SPECIFICATION forming part of Letters Patent No. 267,992, dated.November as, 1882.

a Application filed September 1, 1881. (No model.)

clamp applied to an arm or support having a" straight body. Figs. 3 and4 are a side elevation and a top or plan view,respectively,showin g theclamp applied to an arm or support, the carrying portion of whichdepends from the portion having the clamp. Figs. 5 and 6 are a top orplan view and a side elevation, respectively, showing the clamp appliedto an arm or support provided with a cutting-edge, so as to act as athread-cutter. i

The object of this invention is to construct a cheap, simple, andreliable clamping device, by means of which the attachment of one deviceto another can be readily and quickly where the attachment cannot bereadily made.

0 without removing some portion or part in order made, and when madesuch attachment will be very strong and firm, and at the same timeeasily unclam ped to permit of removal. The deviceis primarily designedto be used in places to secure some other device in position; but it canbe used in other places, and can be applied to various purposes where itis desirable to have a quick and easy form or mode of attachment.

The nature of the invention consists in providin g the device or part tobe attached with a notch or recess adapted to receive the rod, bar, orother device to which the attachment is to be made, and act inconjunction with a setscrew to securely fasten or unite the partstogoth-er, the head of the set-screw acting to draw the two devices incontact with each other.

In the drawings three difierent forms of constructing and applying theclamping devices are shown; but such devices can be applied to otherforms of devices than those shown, such devices in each instance to havea receiving notch orrecess with which the head of a setscrew coacts.

In the drawings, A represents an armor sup-,

port, thebody ofwhich may beformed as shown, or of any other suitableform adapted to furnish a support or means of attachment. One end ofthis arm or support is provided with a recess, a, semicircular in form,and the extreme point or end a of the body A is made to project beyondthe face of the support on the opposite side of the opening or recess a,as shown in Fig. 2, and this face of the body receives theclamping-screw, theshank of which enters a screw-threaded opening formedin the body in proximity to the opening a, and in such relation theretoas that the head of the screw will project part-1y over the opening. Thescrew 1) maybe of the form shown, having its head provided with a notchfor the reception of a screw-driver; or such head may be formed like anordinary thumb-screw, the inner face of the head being so formed as thatit will bite or impinge on the face of the rod, bar, or other devicewhich enters the opening a.

device, and causing it to bite thereon, such ac-.

tion will draw the portion of the arm or support A around the recess ornotch a in close contact with the face of the rod, bar, or other devicein the recess a.

In Figs. 3 and 4 the set-screw is located in a screw-threaded openingformed in the head a on the outer end of the body or support, and thepoint or projecting portion a of the recess, which coacts with the headof the set-screw,is located on the opposite side of the recess from thatshown in Fig. 2, such change in location bein g necessitated bythelocationof the clamping-screw b. The head or support A (shown inthese Figs. 3 and A) is provided with aside arm or extension, A, to theend of which may be attached any device which may be desired.

In Figs. 5 and 6 the body A is formed from a plate, and the recess a isformed by turning The open-.

' the end of the plate around, so that its ex- I and a clamping-screwhaving a straight or flat 30 treme end will form the coacting end orpart a, and, as shown, the body of the arm or plate A is provided with ablade portion, 0. The device shown in Figs. and 6 is designed for use asa thread-cutter, to be applied to the presserfoot bar of asewing-machine, the body of such bar entering the recess a and thedevice being held thereon by the action of the clampingscrew 1), thehead of which is brought in contact with the face of the bar.

Other forms of supports or devices than the 7 three shown can beprovided with the notch or recess a, and projecting point a, andclampingscrew 1), arranged in such relation to each other as that thenotch will receive the device to which the attachment is to be made, andthe set-screw, when forced down, will firmly unite the parts together.

This clamping device furnishes a ready and quick means for making anattachment, is very simple in construction, requiring only a notch orrecess, an engaging-point, and a clampingscrew. The attachment is verystrong and firm, and by the use of the device named the device havingthe parts constituting the clamp thereon can be readily attached to ordetached from the receiving device.

By using a square notch'of the proper size engaging face instead of adiagonal, the attachment can be made to a square bar, rod, or

other device, the same as to a round rod, bar, or

other device, and by changing the form of the notch or recess tocoincide with the device to which the attachment is to be made theclamping-screw and the notch can be used for producing a firmattachment.

The needle of a sewing-machine has heretofore been arranged in a recessin the needlearm and confined in place by a screw having its headextended over the needle to bite thereon, and thus hold the same inplace. Such therefore I do not claim.

What I claim as new, and desire to secure by Letters Patent, is-

A clamping device consisting of an attachable and detachable plate,having at one end a semicircular recess, a, forming the engaging point aat one side thereof, and a set-screw attached to said plate and havingits head extending partly over the recess to bind against a rod or otherdevice on which the plate can be adjusted, substantially as described.

RUSSEL S. BARNUM. Witnesses:

ALBERT H. ADAMS, M. L. PRICE.

